On Monday’s episode of “The Tonight Show,” Jimmy Fallon performed Iggy Azalea's chart-topping song “Fancy” with help from Crosby, Stills & Nash.

In a mock reunion of the folk-rock supergroup Crosby, Stills, Nash & Young, Fallon (dressed as Neil Young) played the guitar and harmonica while David Crosby, Stephen Stills and Graham Nash sang the chorus of the Australian rapper’s hit.